diff --git a/build-metrics.sh b/build-metrics.sh
new file mode 100755
index 0000000..cf12774
--- /dev/null
+++ b/build-metrics.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+METRICS_FILE="build-metrics-$(date +%Y%m%d-%H%M%S).log"
+START_TIME=$(date +%s)
+
+log_metric() {
+    local stage="$1"
+    local elapsed=$(( $(date +%s) - START_TIME ))
+    local elapsed_min=$(echo "scale=2; $elapsed / 60" | bc)
+    echo "[$(date +%H:%M:%S)] [${elapsed}s / ${elapsed_min}m] ${stage}" | tee -a "$METRICS_FILE"
+}
+
+run_stage() {
+    local stage="$1"
+    shift
+    log_metric "START: ${stage}"
+    "$@"
+    log_metric "END:   ${stage}"
+}
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <command> [args...]"
+    echo "Records elapsed time and logs build stage performance."
+    echo
+    echo "Example:"
+    echo "  source build-metrics.sh"
+    echo "  run_stage 'Building ISO' ./mkarchiso.sh"
+    exit 0
+fi
+
+run_stage "$@"
diff --git a/build.sh b/build.sh
index 163f89a..365cf52 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,12 @@
- ./refresh.sh -j && ./mkarchiso.sh
-# sudo rm /var/cache/pacman/pkg/*
-sudo rm -rf ./work
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+source "${SCRIPT_DIR}/build-metrics.sh"
+
+run_stage "Clean workspace" ./refresh.sh -j
+run_stage "Build ISO" ./mkarchiso.sh
+run_stage "Clean build artifacts" sudo rm -rf ./work
+
+log_metric "BUILD COMPLETE"